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Action Shot

From Diablo Wiki

This rune effect enables the Demon Hunter to fire out an arrow or two while Vaulting, each of which deals 75% weapon damage. The arrows target nearby enemies, or even destructibles if no monsters are in range.

Logically, this rune effect should probably hurl a dagger, as some other quick attack Demon Hunter skills do. It's hard to imagine accurately tossing out a dagger while leaping across the room, but it's a lot more believable than firing a bow or crossbow while tumbling upside down.

Realism aside, this rune effect is almost the definition of a novelty skill, as the damage is hardly noticeable compared to the amount of damage done by the hundreds of arrows a minute the Demon Hunter is usually firing out.